Collapsible support device



FIG. 1 is an isometric view of the collapsible support device in a firstposition.

FIG. 2 is a top plan view thereof in the first position, and a bottomplan view thereof is identical to the top plan view.

FIG. 3 is a left side view thereof in the first position, and a rightside view thereof is identical to the left side view.

FIG. 4 is a front view thereof in the first position, and a rear viewthereof is identical to the front view.

FIG. 5 is an isometric view of the collapsible support device in asecond position.

FIG. 6 is a bottom plan view thereof in the second position.

FIG. 7 is a top plan view thereof in the second position.

FIG. 8 is a left side view thereof in the second position.

FIG. 9 is a right side view thereof in the second position.

FIG. 10 is a front view thereof in the second position.

FIG. 11 is a rear view thereof in the second position.

FIG. 12 is an isometric view of the collapsible support device in athird position.

FIG. 13 is a left side view thereof in the third position.

FIG. 14 is a bottom plan view thereof in the third position.

FIG. 15 is a rear view thereof in the third position.

FIG. 16 is a right side view thereof in the third position.

FIG. 17 is a top plan view thereof in the third position; and,

FIG. 18 is a front view thereof in the third position.

The portions of the collapsible support device shown in broken linesform no part of the claimed design.

The ornamental design for a collapsible support device, as shown anddescribed.